doc: fix Markdown linter

PR-URL: #55344
Reviewed-By: Jake Yuesong Li <jake.yuesong@gmail.com>
Reviewed-By: Chemi Atlow <chemi@atlow.co.il>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>

Author: aduh95

doc/api/buffer.md

@@ -518,7 +518,6 @@ the `Blob` data.
 <!-- YAML
 added:
   - v22.3.0
-  - v20.16.0
 -->
 
 The `blob.bytes()` method returns the byte of the `Blob` object as a `Promise<Uint8Array>`.

doc/api/diagnostics_channel.md

@@ -982,7 +982,6 @@ channels.asyncStart.bindStore(myStore, (data) => {
 <!-- YAML
 added:
  - v22.0.0
- - v20.13.0
 -->
 
 > Stability: 1 - Experimental